286.38% is the change from 257 to 993
Calculation steps:
[( 993 - 257 ) ÷ 257] x 100 = 286.38%
Formula
Percentage change = [(993 - 257) / 257] x 100
Subtract the new number by the original number
993 - 257 = 736
736 ÷ 257 = 2.8638132295719845
2.8638132295719845 x 100 = 286.38%